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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old July 12th, 2019, 04:19   #31
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Join Date: May 2012
Location: Asheville, NC
Fuel Economy: 38mix / 47@70-75

Originally Posted by Stephen417 View Post
When I went to look at the air mass specified vs actual... specified stayed at 850

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I'm unfamiliar with your tune, therefore, I have no idea what it's written to. What does the actual do at the same time?
This can be logged and graphed just as boost is.

^^fuel temperature reading b should also be checked before starting the vehicle.^^

Really, when trying to trouble shoot, you should look at all pressures and temperatures before starting the car and after warm. It will tell you a lot.
Fuel temp and air temp should be the same when the car is cold. Fuel temp will increase slowly as the vehicle warms up. This is due to the return fuel warming it up.
Air mass temperature can go down when driving, usually nominal, and goes back up a bit when sitting.
If either temperature doesn't change, or neither are close at startup then the sensor that's the furthest from ambient at first will be wrong.

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Old July 12th, 2019, 06:52   #32
Join Date: Jul 2018
Location: Lunenburg

When I get out of work Iíll make up a few logs. I appreciate the help.

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